The HC-SR04 Ultrasonic Sensor is a popular component for robotics, automation, and DIY projects. It measures distance by sending ultrasonic waves and detecting their echo. Ideal for use with Arduino, Raspberry Pi, and other microcontrollers.

Features:

Operating Voltage: 5V DC

Measuring Range: 2 cm – 400 cm

Accuracy: ±3 mm

Pins: VCC, Trig, Echo, GND

Low Power Consumption

Compact and easy to integrate in projects

Applications:

Robotics (Obstacle Avoidance)

Distance Measurement

Smart Vehicles

Industrial Automation

Security Systems

So the sensor is second-hand (used) and the four pins (sticks) are slightly scratched or bent but still usable. In that case, your OLX ad must: